* {
    margin: 0;
    padding: 0;
}
.nav {
    height: 80px;
    background: -webkit-linear-gradient(left,pink, skyblue);
    /* background: url(../img/bg3.jpg) no-repeat 0 -50px; */
    font-size: 32px;
    font-weight: 700;
    color: rgb(93, 187, 194);
    text-align: center;
    line-height: 80px;
}
#game {
    border: 2px solid skyblue;
}
#box { 
    position: relative;
    position: fixed;
    width: 600px;
    height: 400px;
    top: 180px;
    left: 50%;
    transform: translateX(-50%);
    overflow: hidden;
    display: none;
}
#big-box {
    animation: move 10s linear 1s;  
    /* animation-fill-mode: forwards;  */
    animation-play-state: paused;
}
#big-box p {
    color: pink;
    font-size: 48px;
    text-indent: 2em;
    font-family: '正楷';
    font-weight: 700;
}
@keyframes move {
    0% {
        transform: translateY(0px);
    }
    100% {
        transform: translateY(-100%);
    }
}
button {
    position: absolute;
    height: 50px;
    width: 100px;
    top: 350px;
    left: 50%;
    transform: translateX(-50%);
    /* background: -webkit-linear-gradient(left,pink, skyblue); */
    background-color: rgba(96, 202, 188, 0.4);
    border: none;
    border-radius: 20px;
    font-size: 16px;
    color: red;
    cursor: pointer;
    
}